Thomas a



(Model.)

' I. A.-ED1S0N..

` i y TYPE WRITER.

No.29599o. l j .Patented Apr'. 1,1884.

" Penna mmunmpm mama ma UNITED STATES PATENT OFFICE.

TYPE-WRITER.

SPECIFICATION forming part of Letters Patent No. 295,990, dated April l, 1884.

Application tiled December 9, 1878. Renewed May 525, 1883. (Model.) Patented in England October 29, 1875. No. 3,762; in France May 6, 1876, No. 112,719; iu Belgium May 8, 1876, No. 39,502; in Austria August 23, 1876, No. 26,935; in Italy August 2G, 1876,

No. 8,733, and in Canada September 6, 1876, No. 6,508.

T all whom it'mcty concern:

Be it known that I, THoivIAs A. EDIsoN, of Menlo Park, in the State of N ew Jersey, have invented an Improvement in Duplicate Print,

5 ing, (Case No. 167 of which the following is a'specication. l

In Letters Patent No. 180,857, granted to me, I have set forth a pen for perforating paper, and a press in which the perforated paper is stretched in a frame, and ink from a rollerforced through the perforations, and an `impression made on a sheet of paper laid on abed.`

Type-writing machines have been made in which the type is impinged upon the paper to produce anr impressionfand in stamp-can` celing machines types have been used having roughened or pointed surfaces.

My invention `relates to the method of producing printed impressions in duplicate, consistingin pressingupon paper types in succession each of which has a surface of points so-as toperforate the paper, and then forcing through the perforations ink upon the sheet 2 5 of paper, and thereby printing upon the same. In the drawings, Figure 1 is a section representing one' key and lever of a typewriter, and Fig. 2 is a side and face view of the letter magnified.

A is the roller upon which the paper to be perforated is secured, in the usual manner, felt, blotting-paper, rubber, or other soft material being placed over the roller, and against this the paper `to be perforated lies.

B is the standard or part of a ring', and all the type-levers are arranged so that the perforatingtypes upon their extreme ends will strike one common` center at the roll A. Only one lever and perforating-type is shown in the drawings. p

C is the type-lever; D, the type; f, the wire to the finger-key G. The surface of each type is composed of numerous fine points that will perforate the "l paper when pressed upon it. lThe paper,

after it has been perforated by the types in the words, lines, and sentences required for one page, is removed from the type-writing machine, and the lprinting is performed by forcing inkthrough the perforations upon a 5o sheet of paper in a manner similar to that set forth in my said Patent No. 180,857. It will be evident that these perforating-types may be introduced into any type-writing machine in which sufficient force can be applied to per-V forate the paper and form a stencil of `typeletters, each letter being composedof numcrous perforations.

' This method of `printing is to be distinguished from that in my aforesaidpatent, be- 6oV cause each perforated letter is :made complete by the pressure of a type, whereas in the said patent theletters or characters had to be written or drawn out by hand, and hence could not be made as rapidly or perfectly as by the impression of a type of numerous points. This method is also to be distinguished from the stamp-canceling devices in which asingle stamp is forced into the paper to perforate or mar the'same in a manner; to prevent altera- 7o tion, andthe perforated paper was notused for printing with ink. My method of print-- ing, therefore, necessarily comprises all of the successive operations, and is an improvement in duplicate printing.

I claim as my invention- The method herein specified of producing printed impressions in duplicate, consisting in impressing upon papeiltypes in succession, each of which has a surface of points, so as to perforate the paper, and then forcing ink throughthc perforations upon the sheetto be printed, substantially as set forth.

Signed by me this 4th day of December, A. D. 1878.

rrEoMAs. A. EnIsoN.

Witnesses:

STocKToN L. GRIFFIN, GEO. E. CARMAN.' 

